[libcxx-commits] [libcxx] [libc++][test] Enhance `ADDITIONAL_COMPILE_FLAGS`, use `TEST_MEOW_DIAGNOSTIC_IGNORED` sparingly (PR #75317)

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https://github.com/EricWF approved this pull request.

LGTM too.

Just a heads up, I'm working on an overhall involving how we configure the test suite.
Specifically we want to de-couple the CMake/library build options from the options we use to configure the test suite (So we can better support M:N build configurations to test configurations.)

I don't think this will affect your upstream magic LIT configs much, but if it starts to, let me know.


https://github.com/llvm/llvm-project/pull/75317